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एक उत्तल लेन्स 20 सेमी की दूरी पर स्थित वस्तु का समान आकार का प्रतिबिम्ब बनता है | यदि एक दूसरा उत्तल लेन्स सम्पर्क में रख दिया जाये तो प्रतिबिम्ब इस युग्म से 5 सेमी की दूरी पर दूसरी ओर बनता है | दोनों लेंसों की फोकस-दूरियाँ ज्ञात कीजिए |

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